<template>
  <div class="todo-header">
    <input type="text" placeholder="请输入你的任务名称，按回车键确认"  @keyup.enter="add">
  </div>
</template>

<script>
import {nanoid} from 'nanoid'
export default {
    name:'MyHeader',
    props:['addTodo'],
    data(){
      return{
        title:""
      }
    },
    methods:{
      add(e){
        if(!e.target.value.trim())return alert('输入不能为空')
        // 将用户输入包装成为todo对象
        const todoObj ={id:nanoid(),title:e.target.value,done:false}
        // 通知App组件去添加一个todo对象
        this.addTodo(todoObj)
        // 清空输入
        e.target.value=''
      }
    }
}
</script>

<style scoped>
    .todo-header input{
        width:560px;
        height: 20px;
        font-size: 14px;
        border: 1px solid #ccc;
        border-radius: 4px;
        padding: 4px 7px;
    }
    .todo-header input:focus{
        outline: none;
        border-color: rgba(82, 168, 236, 0.8);
        box-shadow: inset 0 1px 1px rgba(0,0,0,0.075),0 0 8px rgba(82,168,236,0.6);
    }
</style>
